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Browsing by Subject "Diffraction"

Now showing items 1-20 of 21

Acoustic wave diffraction at the upper edge of a two-dimensional periodic array of finite rigid cylinders. A comprehensive design model of periodicity-based devices.

Castiñeira Ibáñez, Sergio; Rubio Michavila, Constanza; Sánchez Pérez, Juan Vicente (European Physical Society, 2013)

[EN] Diffraction at the upper edge of a two-dimensional periodic array of finite rigid cylinders immersed in air as well as the effect on its wave propagation properties are numerically and experimentally reported in this ...
Aperiodic Diffract: Estudio de redes difractivas

Ferrando Martín, Vicente; Calatayud Calatayud, Arnau; Remón Martín, Laura; Monsoriu Serra, Juan Antonio; Pons-Martí, Amparo; Furlan, Walter D. (Universitat Politècnica de València, 2014-03-31)

[EN] In this work we introduce a virtual laboratory, APERIODIC DIFFRACT, developed in Matlab GUI (Graphical User Interface) as an informatics tool for teaching the diffractive properties of aperiodic gratings. This GUI ...
Bifocal Fibonacci Diffractive Lenses

Monsoriu Serra, Juan Antonio; Calatayud Calatayud, Arnau; Remón Martín, Laura; Furlan, Walter Daniel; Saavedra, G.; Andrés Bou, Pedro (Institute of Electrical and Electronics Engineers (IEEE): OAJ, 2013-06)

The focusing properties of diffractive lenses designed using the Fibonacci sequence are studied. It is demonstrated that these lenses present two equal intensity foci and that the ratio of the two focal distances approaches ...
Desarrollo de un sistema ultrasónico TOFD configurable

Moreno Sánchez, Benigno (2014-11-28)

En el presente Trabajo Final de Grado, Desarrollo de un sistema TOFD configurable, se desarrolla un sistema para la aplicación de la técnica de Ensayos No Destructivos TOFD (Time of flight diffraction) o tiempo de ...
Diffraction by m-bonacci gratings

Monsoriu Serra, Juan Antonio; Giménez Valentín, Marcos Herminio; Furlan, Walter Daniel; Barreiro, Juan Carlos; Saavedra, Genaro (IOP Publishing, 2015-11)

We present a simple diffraction experiment with m-bonacci gratings as a new interesting generalization of the Fibonacci ones. Diffraction by these nonconventional structures is proposed as a motivational strategy to ...
Disk-based one-dimensional photonic crystal slabs for label-free immunosensing

Sancho-Fornes, Gabriel; Avella-Oliver, Miquel; Carrascosa Rubio, Javier; Fernández-Sánchez, María Estrella; Brun, Eva M.; Maquieira Catala, Ángel (Elsevier, 2019)

[EN] One-dimensional photonic crystal slabs are periodic optical nanostructures that produce guided-mode resonance. They couple part of the incident light into the waveguide generating bandgaps in the transmittance spectrum, ...
Enhancement of pupil-masked wavelength-scale gas-filled flat acoustic lens based on anomaly apodization effect

Rubio Michavila, Constanza; Tarrazó-Serrano, Daniel; Minin, Oleg V.; Uris Martínez, Antonio; Minin, Igor V. (Elsevier, 2019)

[EN] In this letter, the improvement in focus by the use of a pupil mask produced in an acoustic mesoscale cuboid particle ¿lled with CO2 is reported. Thereby, the result shows that the pupil mask increases the sound ...
Fabrication of ultrafine and nanocrystalline WC-Co mixtures by high energy milling

Bonache Bezares, Victoria; Salvador Moya, Mª Dolores; Busquets Mataix, David Jerónimo; Segovia-López, Francisco (MANEY PUBLISHING, 2009)

[EN] In this work ultrafine and nanocrystalline WC-Co mixtures were obtained by low energy milling in planetary ball mill. The effect of the processing conditions on the reduction and distribution of the grain sizes and ...
Fractal square zone plates

Calatayud Calatayud, Arnau; Ferrando Martín, Vicente; Gimenez Palomares, Fernando; Furlan, Walter Daniel; Saavedra, G.; Monsoriu Serra, Juan Antonio (Elsevier, 2013-01-01)

[EN] In this paper we present a novel family of zone plates with a fractal distribution of square zones. The focusing properties of these fractal diffractive lenses coined fractal square zone plates are analytically studied ...
High-pressure structural phase transition in MnWO4

Ruiz-Fuertes, Javier; Friedrich, A.; Gomis, O.; Errandonea, Daniel; Morgenroth, W.; Sans Tresserras, Juan Ángel; Santamaria-Perez, David (American Physical Society, 2015-03-30)

The pressure-induced phase transition of the multiferroic manganese tungstate MnWO4 is studied on single crystals using synchrotron x-ray diffraction and Raman spectroscopy. We observe the monoclinic P2/c to triclinic P ...
High-pressure theoretical and experimental study of HgWO4

Lopez-Solano, J.; Rodriguez-Hernandez, Plácida; Muñoz, A.; Santamaria-Perez, David; Manjón Herrera, Francisco Javier; Ray, S.; Gomis Hilario, Oscar; Mollar García, Miguel Alfonso; Panchal, V.; Errandonea, Daniel (Taylor & Francis, 2011-03)

HgWO 4 at ambient pressure is characterized using a combination of ab initio calculations, X-ray diffraction and Raman scattering measurements. The effect of low pressure and temperature on the structural stability is ...
Imaging Properties of Kinoform Fibonacci Lenses

Ferrando Martín, Vicente; Calatayud Calatayud, Arnau; Andrés, P.; Torroba, Roberto; Furlan, Walter Daniel; Monsoriu Serra, Juan Antonio (Institute of Electrical and Electronics Engineers (IEEE): OAJ, 2014-02)

In this paper, we present a new kind of bifocal kinoform lenses in which the phase distribution is based on the Fibonacci sequence. The focusing properties of these DOEs coined Kinoform Fibonacci lenses (KFLs) are ...
Knife edge attenuation

Rubio Arjona, Lorenzo (2011-12-09)

The figure shows the attenuation of the knife-edge diffraction in terms of the Fresnel diffraction parameter. Based on the geometrical parameters of the radio link (e.g., distances from the transmitter (TX) and receiver ...
Microwave calorimetry using X-rays

Nicula, R.; Stir, M.; Wurm, A.; Catalá Civera, José Manuel; Ishizaki, K.; Vaucher, S.; Zhuravlev, E.; Schick, C. (Elsevier, 2011-11-10)

An alternative approach for microwave calorimetry is proposed which relies on the synchrotron radiation powder diffraction technique as well as on the Grüneisen formalism for the analysis of thermal expansion. Cobalt was ...
Multiplexing THz Vortex Beams With a Single Diffractive 3-D Printed Lens

Machado-Olivares, Federico Jose; PRZEMYSLAW ZAGRAJEK; Ferrando Martín, Vicente; Monsoriu Serra, Juan Antonio; WALTER DANIEL FURLAN (Institute of Electrical and Electronics Engineers, 2019)

[EN] We present a novel method for experimentally generating multiplexed THz vortex beams by using a single three-dimensional printed element that combines a set of radially distributed spiral phase plates, and a binary ...
New polymorph of InVO4: A high-pressure structure with six-coordinated vanadium

Errandonea, Daniel; Gomis Hilario, Oscar; García-Domene, B.; Pellicer Porres, Julio; Katari, V.; Achary, S. N.; Tyagi, A. K.; Popescu, C. (American Chemical Society, 2013-11-04)

A new wolframite-type polymorph of InVO4 is identified under compression near 7 GPa by in situ high-pressure (HP) X-ray diffraction (XRD) and Raman spectroscopic investigations on the stable orthorhombic InVO4. The structural ...
Pbca-Type In2O3: the high-pressure post-corundum phase at room temperature

García-Domene, B.; Sans Tresserras, Juan Ángel; Gomis, O.; Manjón Herrera, Francisco Javier; Ortiz, H. M.; Errandonea, Daniel; Santamaría Pérez, David; Martinez-Garcia, D.; Vilaplana Cerda, Rosario Isabel; Pereira, A. L. J.; Morales-Garcia, A.; Rodríguez Hernández, Plácida; Muñoz, Alfonso; Popescu, Catalin; Segura, A. (American Chemical Society, 2014-09-04)

High-pressure powder X-ray diffraction and Raman scattering measurements in cubic bixbyite-type indium oxide (c-In2O3) have been performed at room temperature. On increasing pressure c-In2O3 undergoes a transition to the ...
Polyadic Cantor Fractal Ultrasonic Lenses: Design and Characterization

Castiñeira Ibáñez, Sergio; Tarrazó-Serrano, Daniel; Fuster Escuder, José Miguel; Candelas Valiente, Pilar; Rubio Michavila, Constanza (MDPI AG, 2018)

[EN] Traditional acoustic lenses modulate the ultrasonic beam due to their curved surfaces and the refractive material of which they are made. In this work, a different type of acoustic lens, based on Polyadic Cantor ...
Reactive synthesis of Ti-Al intermetallics during microwave heating in an E-field maximum

Vaucher, S.; Stir, M.; Ishizaki, K.; Catalá Civera, José Manuel; Nicula, R. (Elsevier, 2011-08-10)

The time-resolved X-ray diffraction synchrotron radiation technique was used in combination with E-field microwave heating to study in situ the kinetics of intermetallic phase formation in the Ti-Al system. The reaction ...
Towards label-free biosensing in compact disk technologies f or point-of-need analysis

Avellà Oliver, José Miguel (2017-09-01)

This thesis explores new analytical advances using compact disk biosensing technologies, and comprises six scientific publications distributed along four chapters. Special attention is herein payed to Thermochromic Etching ...